NSW has recorded 19 cases overnight as Sydney endures third day of lockdown
All but two cases linked to known outbreaks; 67,000 tests conducted in 24 hours
Only seven cases in isolation for the entire time they were infectious, however
Grants from $5,000 to $10,000 also announced for Covid-hit NSW businesses
Follows Scott Morrison announcing key changes to Australia's vaccine rollout
National cabinet held emergency meeting Monday to discuss Covid outbreaks